Multi-product liquid-solid fluid bed separation classification device and method

Abstract

Disclosed is a multi-product liquid-solid fluidized bed separation and classification equipment and a method. A feed hopper, a liquid distributor, density automatic controllers, a cone-shaped gangue guiding gutter and a plurality of separation and classification chambers sleeved together from bottom to top are adopted. The upper part of each separation and classification chamber is provided with an ore concentrate guiding gutter; an adding raise water pipe with a plurality of nozzles is arranged in each ore concentrate guiding gutter; a density automatic controller is arranged on the outer wall of each separation and classification chamber and the underflow opening of a bottom separation and classification chamber; the liquid distributor is arranged at the bottom of the bottom separation and classification chamber; and a spiral feeding machine which inserts into a lower-part separation and classification chamber is arranged above a top separation and classification chamber. When separation and classification are performed for the material from bottom to top, the granules with the density higher than that of the fluidized bed pass through the bed to enter the underflow to be discharged as gangue or each section of underflow, and the granules with the density lower than that of the fluidized bed can not pass through the bed to be brought to the overfall by ascending current to be discharged by each section of coal products, thereby the liquid multi-production separation and classification for the materials are realized.

Description

technical field [0001] The invention relates to a multi-product liquid-solid fluidized bed sorting and grading device and method, and is especially suitable for the sorting and grading of coarse coal slime, and is also suitable for the sorting and grading of quartz sand. Background technique [0002] At present, most coal preparation processes use a combination of gravity separation and flotation without classification and desliming. The separation particle size limit of the two is 0.5mm. The separation effect of the nearby coal particles is poor, and this part of coal particles (generally 3-0.25mm) is defined as coarse coal slime by the national standard (GB / T 7186-1998). These particles are generally recovered separately through high-frequency sieves in coal preparation plants, and their ash content is between clean coal and medium coal, generally 2-5% higher than that of clean coal, and its final destination is difficult to determine. At present, it is generally not sort...

AI Technical Summary

Problems solved by technology

At present, some coals in our country have a large content of fine particles, and the pre-desliming process is adopted. The removed slime contains a large amount of coarse slime, and this part of the coarse slime has a high ash content, which is currently mixed with medium coal, which seriously affects the production of clean coal. In recent years, a small number of coal preparation plants have used small-diameter dense medium cyclones or spiral separators to separate coarse coal slime, but due to the shortcomings of these two devices, satisfactory results cannot be achieved.

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